Question

the pandas elongated wrist bone or \thumb\ would be explained by darwins theory in which of the following ways?

some pandas acquired \thumbs\ through strenuous activity and then produced offspring with the same characteristic.

some pandas had \thumbs\ of different lengths, and in a new environment, those with longer \thumbs\ were better able to survive and produce offspring.

some pandas acquired \thumbs\ through strenuous activity and were better able to survive.

some pandas had longer \thumbs\ and were able to produce offspring.

Explanation:

Darwin's theory of natural selection states that variation exists within a population, and individuals with traits better suited to the environment are more likely to survive and reproduce. The first and third options suggest acquired traits (Lamarckian, not Darwinian). The fourth option lacks the environmental selection aspect. The second option describes variation in "thumb" length, environmental selection (new environment favoring longer "thumbs" for survival and reproduction), which aligns with natural selection.

Answer:

B. Some pandas had "thumbs" of different lengths, and in a new environment, those with longer "thumbs" were better able to survive and produce offspring.